poa-dapps-voting/src/index.js

import React from 'react';
import ReactDOM from 'react-dom';
import { BrowserRouter } from 'react-router-dom';
import App from './App';
import registerServiceWorker from './registerServiceWorker';
import { Provider } from 'mobx-react';
import newBallotStore from './stores/NewBallotStore';
import swal from 'sweetalert2';

const stores = { newBallotStore };

if (window.web3) {
  ReactDOM.render((
    <Provider { ...stores }>
      <BrowserRouter>
        <App/>
      </BrowserRouter>
    </Provider>
  ), document.getElementById('root'));
} else {
  swal(
    'Please use a web3 browser',
    "You aren't connected to POA Network. Please, switch on Oracles plugin and refresh the page. Check Oracles network <a href='https://github.com/oraclesorg/oracles-wiki' target='blank'>wiki</a> for more info.",
    'error'
  );
}

registerServiceWorker();